NHibernate Eager Fetching Over Multiple Levels

Question

I have a 3-leveled hierarchy of entities: Customer-Order-Line, which I would like to retrieve in entirety for a given customer, using ISession.Get(id). I have the following

Answer 1

If you need to keep your one-to-manys as bags, then you can issue 2 queries, each with only 1 level of hierarchy. eg something like this:

var temp = session.CreateCriteria( typeof( Order ) )
    .SetFetchMode( "Lines", NHibernate.FetchMode.Eager )
    .Add( Expression.Eq( "Customer.ID", id ) )
    .List();

var customer = session.CreateCriteria( typeof( Customer ) )
    .SetFetchMode( "Orders", NHibernate.FetchMode.Eager )
    .Add( Expression.Eq( "ID", id ) )
    .UniqueResult();

Lines get loaded into the NH cache in the first query, so they won't need lazy loading when later accessing eg customer.Orders[0].Lines[0].